Thermostat.



Patented Sept. 25, I900. W. E. MACK.

' THEBMOSTAT.

(Application fll'ed Sept. 19, 1899.)

2 Sha'ets-Shaet I.

(No Model.)

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lllIlll! INVENTOI? 1 1/2 WITNESSES ATTORNEYS.

No. 658,664. Patented Sept. 25, I900.

W. E. MACK.

THEBMOSTAT.

(Application filed Sept. 19, 1999. (No Model.) TSheets-Sheei 2.-

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iUNrrnn STATES PATENT OFFIcE.

WVILLIAM E. MACK, OF OSWVEGO, NEW YORK.- I

TH ERM OSTAT.

SPECIFICATION forming part of Letters Patent No. 658,664, dated September 25, 1900. Application filed September 19, 1399. Serial No. 731,010. (No model.)

To ctZZ whom it may concern:

Be it known that I, VVILLIAM E. MACK, of Oswego, in the county of Oswego, in the State of New York, have invented new and useful Improvements in Thermostats, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to thermostats or thermostatic devices electrically controlled.

My object is to improve the construction of a spring or motor driven thermostatic regulator for dampers, &c., by providing means to control the revolution of the terminal wheel of a train of gearing by a friction-brake device in which the power is applied or released by the swing of a pivotally-inounted angular armature of an electromagnet as the circuit is broken or made through it and in making and breaking the circuit upon the shaft of the winding-drum whenever the circuit is made or broken by the thermostat. It is constructed as follows, reference being had to the accompanying drawings, in which Figure 1 is a front elevation of the device. Fig. 2 is an enlarged detail in elevation of the circuit making and breaking devices upon the winding-shaft. Fig. 3 is a top plan of the drum device for adjusting the brake mechanism. Fig. 4is a side elevation of my invention complete, showing it applied to a furnace.

I provide a power mechanism, here shown as comprising a spring 2, a gear 3 on a shaft 4, driven by said spring, a driven gear 5 on a winding-shaft 6, and a gear 7 upon and driven by said shaft and by means of suitable pinions (not shown) driving the gears 8 and 9 and the brake-wheel 10. Upon the shaft 6 I secure a piece of insulating material 12, and 13 and 14 are spring-fingers mounted upon the binding-screws 15 and 16 and respectively connected to the poles of the thermostat 17 by the wires 18 19. This thermostat can be of any ordinary multipolar construction provided with suitable devices actuated by the rise or fall of the temperature of a room and need not be here described in detail, except to say that the wires 18 19 are suitably connected to the poles or contacts therein in the usual manner. A wire 20 connects this thermostat to the battery 21, and a wire 22 connects that to the electromagnet 23. The armature 24 of this magnet is angular and pivotally mounted at 25, weighted, as at 26, and 27 is a cord, belt, or other suitable device extending over the brake-wheel 10 and down to the drum 28, to which it is secured, said drum being upon a threaded shank, and said cord is tightened by screwing it into a support 29, 30 being a jam-nut. The frame 25, upon which the armature is pivoted, is made angular, as shown, and fits closely over the top of the magnet, so as to take up as little room as possible. By means of this construction the parts may be made compact and take up the least possible amount of room. Thus when a contact is made on the left the wire 19 is energized, a circuit is made through the magnet, the armature is swung, its weighted end raised, the brake-cord loosened upon the wheel 10, the train of gearing is released, the shaft 6 is driven until the finger 14 breaks circuit by engaging with the insulator 12 when the armature is released, the weight 26 exerts its force on the cord 27, tightens it, as a brake-shoe, upon the wheel 10, and stops it, and through it the entire train is stopped. This, for illustration, has operated a draft-damper to open it and a check-damper to close it. Then when, as by the rise of temperature, a contact is made on the left the circuit is made through the wire 18, finger 13, and the magnet and the driving mechanism released to drive the shaft 6 until the circuit is broken by the finger 13 riding onto the insulator 12 at about the same time the finger 14 leaves it.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. In a thermostat, a base, a train of gearing' mounted thereon and provided with suitable driving means, the said train having a terminal brake, and an electromagnet mounted in proximity to said gearing with its cores extending in the same direction as the plane of the base, combined with an armature pivoted above the magnet having an arm extending down in front of the core thereof, and another arm at right angles thereto extending over the magnet; a cord attached to the end of said arm and passing over the brake-wheel, and suitably fastened to the base, means for moving the armature away from the magnet,

cores to tighten the cord, and means for supplying energy to the magnet.

2. In a thermostat, a motor-driven train of gearing, a brake-wheel terminal operated by said gearing, a brake-cord passing over said wheel, a drum 28' provided with a screwthread at one end, a frame 29 into which said screw passes, and a jam-nut 30 placed between the drum and the frame, combined with an angular armature which corresponds to the shape of the magnet, an electromagnet, and a frame which extends over the top of the magnet, and upon which the armature is pivoted, substantially as shown and described.

In witness whereof I have hereunto set my hand on this 7th day of September, 1899.

WILLIAM E. MACK. Witnesses:

N. O. LOMBARD, CHARLES E. CHOATE. 

